1/2 inch clearance on the bottom - be careful when sitting the case on a carpeted floor

I would suggest no matter the clearance that you never put a computer on carpet if you can help it. As simple as a piece of plywood, or shelving laid on the floor and the PC on top of it is a much better solution. What I do for a mid or full tower is cut three pieces of 2x4 to about a half inch wider than the cases width. I then buy a piece of shelving with the width as close as I can get to this , usually going a bit over the needed width and cut it to length about an half inch longer than the case. I put one 2x4 at each end and nail the third in the middle and I have a nice and inexpensive computer stand that gives me good air flow and gets the computer up, off the floor and out of the carpet.